Please note, I am not medically trained, and this isn't advice, just my account
MarkS helped me some months ago with his considerable knowledge about warfarin and INR. After a post of his some years ago I started K2 and have done daily (regular daily dose is most important) ever since. I enjoy more or less consistent INR levels unless I am unwell. I don't ever think about what I eat or drink.
Recently, I was called to the surgery to meet a pleasant new practice nurse, specifically to talk about my lack of attendance at the INR clinic. I explained that I self-test, that I am away a lot, and that I self-adjust. She looked a bit worried, and then I dropped in that I take K2. Her reaction was such I may as well have admitted to taking hard drugs. After a lecture, she gave me a date eight weeks away for the next test and I told her I would never leave it that long; I self-test every 14-20 days. She argued that I didn't need to and it could lead to over-adjustments. Eventually I was told that all she could do is warn me of the dangers but it was up to me.
She called a few days later as she was so concerned about my admission that she spoke to one of the doctors who now wants to see me to talk about it all. I am lucky to have such a proactive surgery and I can't fault the level of care. However!
I forgot about it all and didn't make an appointment. But my prescription renewal came up for review and I had to see one of the GPs. I went armed with up-to-date studies about the benefits of self-testing. He listened carefully, looked at my INR record, my minor, very occasional adjustments and told me he was happy with what I was doing. He even asked if I was trained in any medical discipline as I knew all the terminology - well that's only because of what I have learned on here!
Finally, if there any left on the forum who need persuading to self-isolate, please listen to the friend of my daughter and her husband - a very fit young man.